Valve



L. O. SELBY May 6, 1941,

I 2 Sheets-Sheet 1 VALVE Filed Dec. 26, 1954 May 6,1941.

L. O. SELBY VALVE Filed Dec. 26, 1934 2 Sheets-Sheet 2 WP MEEEEEEG M MEPatented May 6, 1941 VALVE Lynn Otis Selby, -Wethersiield, Conn.,assignor to The Sparmal Engineering Corporation, a corporation ofConnecticut Application December 26, 1934, Serial No. 759,196

8 Claims. (01. 236-99) My invention relates to valves.

It has among its objects to provide an improved valve, and moreparticularly an improved thermostatic valve, operative to produce an exceedingly sensitive and effective control means and one of an improved,simplified, and rugged construction involving a minimum number of partsof improved construction and adapted to be very economically produced. Afurther object of my invention is to provide such an improved valve soconstructed and associated in an improved manner with the supply passagewhich it controls, that an improved movable valve member cooperates withthe passage and acts to vary the cross section of the latter uponmovement relative to said passage, while requiring no conventional seat,and utilizing the bottom and'side walls of the valve member as theytraverse the supply passage, to vary the flow through an improvedorifice and clear the latter. Another object of my invention is toprovide such an improved valve especially adapted to control the oilflow for oil burners 01' various type-gin such manner as to make itpossible efiectively to maintain a variable flame at or above apredetermined minimum setting throughout the operation of the burner,while at the same time making it possible for the oil supply to bereduced to minimum limits heretoiore incapable of being obtained, and,even at such minimum settings, maintaining the flow of oil uninterruptedand free from stoppages due tov the accumulation of dirt or scale in thevalve mechanism. Still another object of my invention is to provide sucha valve for controlling the oil supply or oil burners which hasimprovedtemperature controlled means and is operative in such manner as toenable the valve to be automatically adjusted from its maximum to itsminimum setting described, so that the flow of oil through the valve,and hence to the burner, may be automatically varied to meet therequirements as to selected temperatures to be maintained.

A still further object of my invention is to provide improved means foradjusting the heat, and improved means for adjusting the oil flowwhereby the desired adjustments of both may be made with facility.Another object of my invention is to provide an improved combined valveand thermostat especially adapted to be inserted as control meansassociated therewith, is also adapted to be manufactured at smallexpense, and to be operative" with certainty over a long period with aminimum of necessary attention. These and other objects of my inventionwill, however.

hereinafter more fully appear.

In the accompanying drawings I have shown for purposes of illustrationseveral embodiments which my invention may assume in practice.

In these drawings- Figure 1 is a side elevation of one form of animproved thermostatically controlled valve unit,

the same being shown connected in an oil supply line;

Fig. 2 is a vertical sectional view 01 the valve and adjustingconnections therefor, the valve being shown in one minimum flow setting;

Fig. 2a is a vertical section through the thermostat of Figs. 1 and 2;

Fig.3 is an enlarged detail view of the valve and the oil supply passagein the above settin Fig. 4 is a like view but showing the valve in fulland dotted lines in different positions of more full flow, occupiedthereby inresponse to the thermostat; I

Fig. 5 isa sectional view on line 5-5' of Figure 2 Fig. 6 is also a viewon line 5-5 but looking in the opposite direction, as indicated by thearrow 6-4;

Fig. 7 is a view similar to Figure 2, but showing a modifiedconstruction;

Fig. 8 is an enlarged detailed view similar to Figure 3 but showing thismodified construction;

Fig. 9 is an enlarged detail view similar to Figure 4 but showing thismodified construction;

Fig. 10 is a view similar to Figures 2 and 7 but a unit in the oilsupply line of an oil burner, and

I which is of an improved and simplified construcomitting certain commonstructure to facilitate illustration I Fig. 10a is a vertical sectionthrough the thermostat of Figure 10;

Fig. 11 is an enlarged detail sectional view on linev I I-Il of Figure10, and

Fig. 12 is a further detailed view showing the form of means forpreventing the entry of dirt from the top while permitting the ventingof air through the oil line and through these means.

Referring first to the form of the invention shown in Figures 1 to 6inclusive, it will be noted that I have shown a type of valve adapted tobe disposed in an oil line and responsive to changes in atmospherictemperature adjacent the valve, this valve and the thermostatic controlmeans further being improved as will hereinafter more fully appear.

Referring more particularly to this construction, it will be observedthat the valve member proper is herein in the form of a valve member orplunger I of uniform cross section, herein cylindrical, and running witha close fit in a cylinder 2, a clearance preferably of from twenty-fiveten thous-andths (.0025) of an inch to thirty ten thousandths (.0030) ofan inch, and not to exceed thirty-five ten thousandths (.0035) of aninch, being provided, and both the valve member I and cylinder 2 alsobeing substantially elongated, asillustrated: Here it will also be notedthat the valve I is shown as provided with a flat circular bottom face 3at right angles to the axis of the member I. Moreover, it will be notedthat the lower extremity of the member. I is so disposed as, with thecylinder 2, to traverse a relatively transverse oil supply passage 4 ofsmaller cross section than the cylinder 2; the plunger I moving intothis passage 4 intermediate the ends of the passage while the cylinder 2extends above and below the passage. Thus, the opposite edges or sidewalls, on the extremity of the portion I increase or decrease the crosssection 'of the avail able opening through the passage 4 as the plungerI moves up or down in the cylinder 2, to produce a gradual enlargementor decrease of the oil flow through the passage 4. Due to the structuredescribed, including the curved bottom of the passage 4 and the flatface 3 on the plunger I of larger cross section, it will also be notedthat it is possible to move the plunger I down into such positions as topermit very minute, yet constant oil flow through the portion of thepassage 4 remaining open. For example, it is possible for the plunger tobe so far down as not to permit light to be seen through the passage 4and yet to maintain an effective oil flow orifice adapted to maintain aconstant low flame. In fact, a low flame may be maintained even when theadjustment is so fine that it is only possible to blow through thePassage 4.

In the form of my invention shown in Figures 1 to 5, I illustrate oneform of bottom support or' limiting means for the plunger which may beused, if desired. Herein, this isin the form of a pin 5 having an uppertapered end 6, preferably tapered to a sharp point similar to that of asharpened lead pencil point, and engageable with the center of the flatbottom 3. pin is disposed in the portion of the cylinder 2 below the oilpassagel and the extreinity of the tapered end 6 is disposed slightlyabove the bottom of the passage 4 in such manner as to maintain theillustrated minimum oil flow or setting. However, it'will be understoodthat this oil flow is only illustrative, and that the amount of flow maybe varied either by varying the movement of the plunger I relative to agiven setting of the pin 5, or by making the latter adjustable. Herein,I have shown the same'as adjustable, and have illustrated the pin ashaving a threaded portion I on its lower end threaded into a threadedbushing 8 and suitably locked in selected positions therein as by a locknut 9, while the bushing itself is threaded as at II) in an extension IIon the casting I2 in which the cylinder 2 and oil passage 4 are formed.Also, it will be noted that the bushing 8 is herein in the form of agland acting to compress a suitable packing I3 which surrounds the upperend of the pin though substantially spaced below the extremity thereof.Thus, it will be evident that by adjusting the pm As shown, this 5, asbyrotating a nut I4 on the bottom extremity thereof after suitablyreleasing the lock nut 9, the vertical position of the pointed extremity5 may be varied as desired, in such manner as to vary the possiblebottommost limit of the plunger I and, accordingly, vary the minimumsetting by varying the portion of the cross section of the oil passage 4which is open in the bottommost position of the plunger. Here attentionis particularly directed to the fact that due to the pointed portion 6on the pin 5, the possible area on which dirt, scale or the like mayaccumulate and interfere with the full downward movement of the memberI, is minimized, at the same time that a construction is providedwherein any movement of the bottom face 3 of the member I into or out ofcontact with the pointed extremity 8 on the pin, will tend to dislodgeany material on the point. It will also be observed that an annularchamber I5 surrounds the bottom of the pointed portion 6, which acts tocollect any dirt flowing in through the oil passage 4 after the oil hasentered beneath one side wall of the plunger I and before it passes outunder the opposite side of the latter, dirt in the oil thus tending tobe separated out by gravity or contact with the wall of the chamber I5while the oil passes through the valve. It will also be noted that theoil leaving the. left hand end 'of passagev 4 is herein passed into alarger chamber I3 leadingto the burner. It will be evident that thepassage 4 may be cleaned longitudinally when desired through the chamberI6, while the annular passage I5 may also be cleaned by withdrawing-thepin 5 vertically downward.

Operatively associated with my improved valve are improved thermostaticactuating means therefor, disposed above the valve plunger I andoperatively connected thereto through improved adjustable operativeconnections and cooperating with the plunger I to produce improvedresults. Herein, it will be noted that the valve plunger I is connectedby a ball and socket joint 22 at its upper end to the lower end of anupstanding rod 23 of substantially smaller cross section than thecylinder 2 and also of smaller cross section than a passage through acoupling 24, of any suitable length, which is threaded into the top ofthe casting I2 and carries a thermostat, hereinafter described, whichacts on the rod 23. Herein, it will be noted that the member 24 hassuitably connected thereto a stationary triangular upright open frame25, the lower ends of which are brought into spaced parallelism andunitarily connected to an enlargement 26 on the top of the member 24, asby screws 21. Herein, this frame 25 also has a threaded member 28extending upward through its upper transverse portion, and nuts 29 arethreaded on the member 28 outside the frame, while a spring 30 is coiledabout the member 28 between the frame and a suitable thermostaticallyoperated expansible means 3I supported on the rod 23 and expansiblevertically in the frame 25.

This expansible means is of the well known disc or wafer type adapted toexpand and contract vertically upon changes of temperature of thesurrounding air, due to the expansion or contraction therein of anysuitable expansible or volatile fluid adapted to expand substantially orcontract to a substantial extent upon slight changes in temperatures andextremely sensitive and responsive to changes in temperature over theparticular temperature range to be controlled. As shown in Fig. 20,,this means 3| comprises two expansible hollow discs 3| containing anysuitable quantity of expansible fluid, and these discs are connected bya suitable axial connection having an axial aperture 3| therethrough sothat both discs will expand or contract vertically to a substantialextent upon heating or cooling of the contained fluid by the airsurrounding the discs. Also, it will be observed that the threadedmember 28 has an enlarged lower end 3 I fixed to the top face of the topdisc which forms the bottom abutment for the spring 30, while the upperend of the member 28 is slidable through a hole 3 I in the frame 25.Herein, the lower disc of the means 3| also has a coaxial extension 32on its lower face provided with an annular groove 33 and connected byaset screw 34 entering that groove, to a sleeve 35 threaded on the upperthreaded end 36 of the rod 23. Moreover, it will be noted that betweenthe bottom of this sleeve 35 and the top of the portion 26 on the member24, a turning member 31 is provided which is adapted to rotate thethreaded portion 36 in the member 35 in such manner as to cause thevalve member to be raised or lowered relative to the portion 35 andthereby vary'the possible expansion, or stroke, of the bellows 3|. Also,it will be observed that a separate lock nut 38 is provided on thethreaded portion 36 to fix the member 31. Herein, this nut 38 isdisposed as preferably, i. e. spaced somewhat above the top of theportion 26, so that it will not act as a stop limiting the downwardmovement of the plunger I and that, accordingly, the setting of thevalve I may be varied by adjusting the vertical position of the pin 5.

In the operation of this mechanism, it will be evident that with theunit connected in the oil supply line of a burner and the expansiblemeans 3| responsive to changes in the temperature of the atmospheresurrounding the means 3|, an oil flow will be maintained through the oilpassage, 4 adapted to maintain a minimum or low flame determined by thesetting of the pin 5 while increasing the oil fiow in accordance withthe changes in temperature affecting the means 3|. More particularly,with the means 3| extended latter.

downward to the maximum amount permitted by the setting of the pin,which'prevents further downward movement of the plunger a low flame willbe maintained of a size determined by that setting, which in turndetermines the amount of oil flowing through the passage 4 under thebottom face 3 of .the plunger and around the pointed extremity of thepin 5 in the center of the plunger and out through the like orificemeans provided on the opposite side of the plunger. Should thetemperature of the atmosphere surrounding the means 3| drop, however,this means will contract vertically in such manner as to pull up the rod23 and thereby pull up the plunger in such manner as to increase thearea of the flow passage through the valve as the lower extremity of theplunger is raised up out of contact with the pointed extremity of thepin. Thus, obviously, the cross section of the orifice provided by thevalve between the two parts of the passage 4 will be variedautomatically, as determined by the position of the means 3| and thetemperature, between the predetermined minimum or low flame setting ofthe pin 5 and a full open position clearing the passage 4 for fullcapacity flow'. It will further be evident that by suitably adjustingthe pin 5 vertically, the amount of minimum flow and the consequentminimum size of the flame, may be varied within wide limits, while byincreasing or decreasing the effective length of the member 36, thetemperature to be maintained may be lowered or raised as desired anddetermined with 'nicety. Moreover, the upper and lower limits arecapable of being disposed in a very limited temperature range, thetemperature being capable of being maintained within a degree, ifdesired. In operation, the plunger will assume a balancing relationabove pin 5 in such manner as to maintain the desired temperature withonly a flame of moderate size, a larger flame only being requiredfollowing a sudden change in room temperature, as when a door or windowis opened.

Attention here is also directed to the fact that the plunger movesfreely in the cylinder 2 without binding, irrespective of variations inthe connections between the same and the thermostat, the ball and socketjoint 23 being such as to maintain the desired free movement of theplunger under all conditions. It will also be observed that although theclearance between the plunger and the cylinder 2 is small, it is stillsufiicient to permit air to flow up out of the oil line into the spacesurrounding the rod 23 and to the atmosphere in such manner aseffectually to prevent formation of an air lock in the oil line whichotherwise might prevent the flow of oil. Also, it is found that the oilwill not flow up through the cylinder 2 and coupling 24 and escape overthe top of the Moreover, note here that it is also pos-' sible to" usethe plunger I as a pumpsplunger for pumping air out of the line shouldthis be necessary. It is also to be noted that due to the shape of theorifice beneath the bottom face 3 and formed by the latter and thearcuate bottom of the oil passage at opposite sides of the plunger anorifice. is provided which is not only very diflicult to clog, but whichis substantially self cleaning, as the adjacent side walls of I theplunger I move with a shearing action vertically relatively to thecurved line of intersection between the cylinder 2 and the passage 4, i.e. as the plunger moves in the cylinder 2 across the portions ofthe'passage 4. Moreover, the point 6 of the pin 5 also tends to beautomatically cleared both by the oil flow relative thereto andas aresult of the effect of the plunger movement in loosening or dislodgingany material which may adhere to the-point so that the material iscarried off in the movin oil from obstruction or requiring cleaning ofthe valve. It will also, of course, be evident that the valve structure,by reason of its simplicity, may be very readily and cheaplymanufactured and is of a character adapted to have long life. These andother advantages will, however, be more clearly apparent to thoseskilled in the art.

In Figure 7, I have illustrated a modified construction which may beused if desired. Here, it will be noted that this structure isessentially similar to that previously described and claimed, althoughdeparting therefrom in certain respects hereinafter mentioned. Thus, itwill be the member 21, the latterxis adapted to rotate member 35 and isfixed thereto, and a nut 45 is' provided above the member 21 serving asa lock nut for the end of the threaded end 55 of the rod 22. Moreover,it will be noted that a tube 4| is seated in the lower end of thecasting R and that this tube at its upper. end is a modified form of pinis provided beneath the plunger I. More particularly, a pin is providedwith a pointed end 44 projectable into the oil passage 4 and formed asan axial projection on a shallow cylindrical disc 45 disposed in thelower end of the cylinder 2 and below the oil passage 4. Here it willalso be noted that, as heretofore, an adjusting ,screw 45 is seated in abushing 41 and locked in different positions by a lock nut 45. Also, itwill be noted that spaced beneath the disc. 45 and between the same andthe screw48, a pointed projection 49, generally corresponding to themember 45, is provided which has a projection 50 corresponding to thepointed projection 44 on the member 45, while acoiled spring 5| isdisposed between the bottom of the member 45 and the top of the member49. In a preferred construction, the spring 5| has its opposite endsfixed to the members 45 and 49 and the member 49 is separate from themember 45, so that the spring with the connected memb s 45 and 49constitute a unit, but it will be evic nt that, if desired, the member49 may be formed directly on the pin 45 so that the point 50 forms theupper extremity of the pin, and that in eitherform a spring 5| may beused which simply abuts against the members 45, 49 without beingattached to either. Herein, it will also be noted that an open chamberfree from packing surrounds the lower end of the spring 5|, while themember 41 is provided with a tapered thread, but it will also be evidentthat a suitable packing may be used in this chamber, if desired, inwhichcase the tapered thread between the parts 41 and II will be unnecessaryand a gland generally similar to the gland 8 may be used. 4

In this construction, it will be evident that the spring 5| willconstantly urge the projection 44 into contact with the bottom 9 of theplunger and, within limits, urge the latter up out of the maximum downposition thereof. Further, it will be evidentthat when the plunger ismoved or free to move as a result of temperature changes, the springwill function to produce an even flow of oil and more gradual changes inthe area of the flow orifices and consequently in the volume of theflowing oil. It will also be evident that the possible range of upwardmovement of the projection 44 will depend upon the strength of thespring 5|, and be noted that a substantial range of movement ispermitted the point 44 before the member 45 will obstruct the flowthrough the passage 4. It will also be noted that after the limit ofupward movement of the point 44 has been reached, the plunger I may moveindependently upward as desired. Further, in this construction, it ispossible under extreme temperatures for the plunger to be moved downwardin such manner as to cut off the flow through the passage 4 if thisshould be desired, although such a complete cut oif is not desirablesave under unusual circumstances; the maintenance, instead, of aconstant small circulation of oil to maintain a low flame being denotedthat instead of a nut ,being provided under siredin' the huge majorityof installations where the;,expansible means is responsive to roomtemperatures. Also, it will be evident that with the member 50 fixed tothe pin 46, and the spring 5| separate from 49, upon simply removing themember 45 and spring 5|, this member 48 may be adjusted upward toproduce the construction of Figure 2.

In Figure 10 I have illustrated a further moditied construction whichmay be used if desired. Here-it will be noted that a one piece casing 52takes the place of the members I2, 24 and 25 of Figure 2, and of themembers I2, 4|, 42, and 25 of Figure 7. This casting 52 has a singleupright arm 53 thereon having an overhanging end 54 on which theexpansible means in the form of a bellows 55, herein of smaller diameterand of a greater number of sections than that heretofore described, issupported adjacent the top and connected directly to a rod 56 the upperend of which carries an adjusting member 51 fixed thereto, and isthreaded, as'shown at 55, into an extension 59 onthe lower end of thebellows 55.

Also, it will be noted that this rod 55 passes pin 6| is used which, inturn, has an axial chamber 62' in its upper end. In this chamber 52 isseated a pointed top member 53 having a point engageable with the face 3of the plunger and a shoulder 54 thereon and normally pressed up by acoil spring 55 within the chamber 52, against a bent over rim or edge 55on the upper end of the pin 5|, the remainder of the pin 5| and itsadjustable mounting being essentially similar to that shown in Figure 2.Attention is also directed to the fact that the casting 52 here has merethreaded sockets 51 directly at the opposite ends of the oil passage 4.

The operation of this construction will evidently be closely similar tothat shown in Figure 7, with the exception that the bent portion 55 inthe upper end of the pin 5| will serve as a means of limiting the rangeof possible upward movement of the pointed member 53, while it willfurther be evident that adjustment of the pin 5| in either directionwill automatically adjust the pin 6| bodily therewith relative to thepassage 4 and plunger Here it will also be evident that, as shown inFig. 100,, the bellows 55 is 01 a type having a deeply corrugated sidewall 55* of smaller diameter and an internal central post 55" limitingcollapse, this structure being adapted to use in connection with anexpansible fluid supplied to the interior thereof through a tube 59which may be connected in any well known manner to a more remote sourceof heat to be controlled. It will, of course, also be clear that thisconstruction is not only markedly more simple and inexpensive than thosepreviously described, but that the same is more readily assembled andadjusted, while also eliminating need for a separate top spring. Thisconstruction is also adapted to use under difl'erent conditionsrequiring a wider range of temperature variation. It

isalso adapted to cut oil the fuel flow completely abnormally extended;the valve, as in Fig. 7, also automatically reopening as the temperaturesub- 'venting the entryof dirt from the top down through thepassageisurrounding theplunger operating rod while continuing to permitair flow for venting, which means may be used on any of the above forms;Here preferably I employ a band H of light, loose string, fabric, orfelt, of slightly less diameter than the passage and movablefreely'therein without drag, and tied about the rod at any convenientpoint inside the passage below the threads, it being found that thisband acts effectively in'keeping dirt from dropping down and workinginto the valve while also permitting air flow up through and around theband.

As a result of my improvements, it-will' be noted that previousdifllculties in obtaining a satisfactory small flow of oil to maintain alow flame are overcome. More particularly, with needle and other valvespreviously used, marked difllculties have been experienced withclogging,

due in large part to the annular seat required in such valves and onwhich material accumulates so quickly, particularly in fine settings ofthe valve, as to clog the latter and make a low flame go out. In myimproved construction, on the contrary, wherein there is no conventionalseat or the equivalent of such a seat, it will be observed that no sucharea is provided on which such a quantity of material may accumulate.Moreover, the opening and closing, being eifected by the side wall ofthe valve, is such as to produce a very efiective shear or cleaningeffect, while the orifice provided is such as to be exceedinglyeffective and adapted to maintain even a minute flow. It will also beevident that through associating an expansible fluid means with myimproved valve, it is made possible to make the latter readilyresponsive to changes in temperature aflecting these means and, as thetemperature changes, to actuate the plunger to obtain an efiectivelongitudinal movement of the same slowly in either direction ofexpansible or contractible movement, and to do this while the oil isflowing through my improved orifice in-such manner as to assist incarrying away any such material which seeks to collect either on thewalls or on the point and walls and which will be loosened by themovement of the plunger. It will be noted that in this construction themovement of the valve is not only gradual but directly in accordancewith temperature changes, as distinguished from delayed action and thensudden movement of the valve. Such a sudden movement results in a mostobjectionable carbonization of the burner which is eliminated in myimproved construction wherein, even after a long period of operation,there is no visible carbonization of the burner. Attention is furtherdirected to the fact that all need for a spring opposing the action ofthe bellows and acting on the plunger to return the latter iseliminated, with not only a consequent increase in sensitivity ofcontrol but an entirely new gradual action of the valve. Here also notethat I am able to eliminate both the cost of the springs and anynecessity for obtaining matching of all thermostats and springs in orderto make it possible to obtain the desired results. It will also be notedthat in certain forms, such for example as is shown in Figures 7 and 10,the spring returning the This application is a continuation in part of,

application Serial No. 687,703, filed August 31st, 1933.

While I have in this application specifically described certainembodiments which my invention may assume in practice, it will beunderstood that these forms of the same are shown for purposes ofillustration and that this invention may be modified and embodied inother forms and applied to other devices than oil burners or thermostatswithout departing from its spirit or the scope of the appended claims. 2

What I claim as new and desire to secure by Letters Patent is:

1. In a valve, a support, temperature responsive expansible meanssuspended at one end thereof, a rod movable in said support andadjustably connected to said means, a valve plunger movable in saidsupport and operated by said rod, said support having a cylinder inwhich said plunger moves, a communicating chamber in which said rodmoves, and a controlled passage intersecting said cylinder and havingthe cross section of said passage controlled by said plunger, a plungerabutmentmeans including a pin in the bottom of said cylinder normallyinoperative on said plunger and engageable with the lower end of thelatter to establish a minimum fiow position of said plunger, andcarrying means for said pin including threaded means carried by saidsupport and threaded in said support, and means for adjusting said pinadjustably threaded in said threaded means;

2. In a valve, intersecting plunger and controlled passages, a plungerin the plunger passage movable across said controlled passage to varythe cross section thereof and cooperating with said passages to form acommunicating orifice therebetween, expansible fluid operatedthermostatically controlled means controlling said plunger and actuatingthe latter in opposite directions gradually as the expansible fluidgradually responds to temperature changes, and resiliently mounted meansbeneath said plunger operative on said plunger when the free end oi! thelatter moves in one direction across said controlled passage whilenormally inoperative on said plunger and normally maintained spacedabove the bottom of said controlled passage while maintaining saidcontrolled passage substantially free from obstruction.

3. In a thermostatic valve, a valve body having a fluid supply passageand a plunger passage disposed transversely of a controlled portion ofsaid supply passage, and means for controlling said supply passageincluding a plunger having a controlling portion movable in said plungerpassage to vary the cross section of said controlled portion, expansiblefluid operated plunger actuating means actuating said plunger in bothdirections in response to the expansion and contraction of the fluidacting thereon, and abutment means having a pointed end engageable withthe end of said plunger mounted in a pertion'or said plunger passage onthe opposite side of said controlled portion from said plunger andhaving its pointed end projecting above the bottom of said supplypassage and cooperating with said plunger to maintain a minimum orificein said controlled portion while maintaining said supply passage.substantially free .from obstruction by said abutment means, saidabutment means being resiliently mounted and yieldable to permit cuttingon of the supply passage under abnormal temperatures affecting saidfluid.

4. In a thermostatic valve. a valve body having a horizontal fluidsupply passage extended therethrough, a vertical plunger passage alsoextended through said valve body and intersecting said supply passage, aplunger vertically reciprocable in said plunger passage to vary thecross section in said supply passage. abutment means in the lower end ofsaid plunger passage comprising a member vertically adjustable thereinand having an axial recess in its upper end, an abutment member in saidrecess having an upper reduced end portion normally projecting into saidsupply passage and adapted to engage and limit the downward movement ofsaid plunger, and means yieldingly supporting said abutment member insaid recess permitting said member to yield downwardly relatively tosaid adjustable member and permit said plunger to completely close saidsupply passage.

5. In a valve, 9. support, temperature responsive expansible meanssupported thereby, a rod movable in said support and adjustablyconnected to said means, a valve plunger movable in said support andoperated by said rod, said support having a cylinder in which saidplunger moves, a communicating chamber in which said rod moves, and acontrolled passage intersecting said cylinder and controlled by saidplunger. a plunger abutment pin in the bottom of said cylinder, aresilient connection between said pin and said support urging said pininto engagementwith said plunger, and adjusting means for said pinincluding a member adjustably mounted in said support and housing saidresilient connection and carrying means for limiting the movement ofsaid pin in one direction.

6. In a thermostatic valve, a valve body having a fluid supply passage,a vertical plunger passage intersecting said supply passage, 8. plungermovable in said plunger passage to vary the cross section of said supplypassage, a bracket rigidly connected with said valve body having aportion extended over said plunger passage, 8. corrugated verticallyexpansible bellows having its upper end rigidly fixed to said laterallyextended bracket portion, a coupling member carried by the lower end ofsaid bellows and a connecting rod connecting said plunger withsaidbellows having-an adjustable screw threaded connection with saidcoupling member, and abutment means comprising an axial member carriedby one end of said bellows within the latter and engaging the oppositeend of said bellows to limit the collapsing movement thereof.

'1. In a control valve 01' the class described.

comprising a long vertically arranged casing having a small vertically.arranged bore therein. the lower end of which is enlarged, and atransversely arranged fluid passage intersecting the bore slightly abovethe enlargedpart thereof, an

part of the bore, with that part of the enlarged portion above the plugforming a chamber, a screw threaded in the plug, a spring having itslower end engaging the screw, and a pin in that part of the bore belowthe passage and having one end engaged by the upper end of the springand its opposite end engaging the bottom or the core, and temperatureresponsive means operatively connected to the upper end of the core.

8. In a control valve of the class described comprising along verticallyarranged casing having a small vertically arranged bore therein, thelower end of which is enlarged. and a transversely arranged fluidpassage intersecting the bore slightly above the enlarged part thereof,an imperforate valve core slidaLly arranged in the bore and having asnug fit therein and closing the passage when the lower end oi the coreis in that part of the bore below the passage, a plug threaded in thelower end of the enlarged part of the bore, with that part of theenlarged portion above the plug forming a chamber, a screw threaded inthe plug, a spring having its lower and engaging the screw, a pin inthat part of the bore below the passage and having one end engaged bythe upper end of the spring and its opposite end engaging the bottom ofthe core, temperature responsive means operatively connected to theupper end of the core, such means including a rod having a ball andsocket connection with the upper end of the core and said rod having aloose flt with that part of the bore through which it passes.

LYNN OTIS SELBY.

CERTIFICATE OF CORRECTION.

Patent No. 2,214.1 ,52u. May 6, 191:1.

LYNN owls SELBY.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 11.,second column, line 11, for the word "casing" read "casting"; page 5,second column, line 56, claim 1, strike out "a" first occurrence; andthat the said Letters Patent should be read with this correction thereinthat the same may conform to the record of the case in the PatentOffice.

Signed 'and sealed this 15th day of Jul A. D. 19in.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

